In Iron Man (2008), Tony Starks gets hit with a grenade, the sharpnel rip through his bullet proof vest and into his body.
Now, Yen Sin, a doctor, helps Tony by constructing a electromagnet and places it inside of Tony’s chest, keeping the grenade shrapnel from moving and reaching his heart and if the electromagnet is turned off for whatever reason, the shrapnel move again inside of him.
Is that realistic, would shrapnel continue to move inside a person even after it gets stopped?
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Not a scientist by any means, but I’m not sure how the magnet could keep the shrapnel in place. Even if the magnet could keep the shrapnel static in place relative to itself, the heart moves and I’d assume micro changes in position when it beats or when you adjust position. That would mean it’s probably still tearing and cutting at his heart in a way that would require medical attention.
The magnetic field would need to be dynamically shifting with the heart and keeping it in place that way I would guess. Now, is that even the LEAST unbelievable thing Tony has created over the course of the series? No. So we can all just say Tony is that smart and move on. But if you’re asking if it’s realistic…Justin Hammer has an Ex-Wife he’d like to sell ya.